. Soil physics and management. >arts of thev\>untry and the form of drainage adaptetl to them is that of deadfuriv^ws or shallow ditches aUnit ^0 or ^o feet a\>art. These awemployed to a lar^ extent on aT so\~eral serious ohjectii>ns to o^x^n drains. They art?almo$t invariably expensix^ forms, l^ecause constant care is needed DRAINAGE 227 to keep the ditches open aud in good condition (Figs. 98, 99, a few years the fail may beeonne very uneven, due to more rapideroHion at one place than at another. Obntru/itionH may get into )H Fro. ?)). Fio. 98.—The obotructionH ;

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. Soil physics and management. >arts of thev\>untry and the form of drainage adaptetl to them is that of deadfuriv^ws or shallow ditches aUnit ^0 or ^o feet a\>art. These awemployed to a lar^ extent on aT so\~eral serious ohjectii>ns to o^x^n drains. They art?almo$t invariably expensix^ forms, l^ecause constant care is needed DRAINAGE 227 to keep the ditches open aud in good condition (Figs. 98, 99, a few years the fail may beeonne very uneven, due to more rapideroHion at one place than at another. Obntru/itionH may get into )H Fro. ?)). Fio. 98.—The obotructionH ;rl<:T<; with th; curr<;rit and cau»; df;fli. ^fl. C, Whjekrr.;Fio, 99.—Ditoh gradually b<;ing fill:^] bj hoil due to current being retarded b;. graise.

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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1917